If 80% of the cases belong to Class 0 and 20% belong to Class 1, what is the Gini index?
A) 0.32
B) 0
C) 0.40
D) 0.16

Name: If 80% of the cases belong to Class 0 and 20% belong to Class 1, what is the Gini index? A) 0.32 B) 0 C) 0.40 D) 0.16
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Question

Quizplus · Accepted Answer

The Gini index is calculated as 1 - sum(p_i^2) for each class i, where p_i is the proportion of items labeled with class i. For two classes with proportions 0.8 and 0.2, the Gini index is 1 - (0.8^2 + 0.2^2) = 1 - (0.64 + 0.04) = 1 - 0.68 = 0.32.

If 80% of the Cases Belong to Class 0 and 20